Even a small residential fridge is usually 40-50% larger than an RV fridge. The biggest absorption fridge model is 12 cu ft, while even apartment size residentials run 16+ and most models are 18-26 cu ft. The cool more reliably and consistently, they circulate cold air inside for a more even temp, and they rarely ever catch fire from leaking corroded boiler tubes. Other than that, they aren't much better.
Modern residential fridges are very economical to run, so there is little or no energy penalty to using one in an RV. The auto defrost and anti-condensation circuits are the most likely to hog energy if trying to boondock for long periods. Some models can turn them off, but not all. If you can't turn them off, just plan on running the generator a bit longer each day. Or add a couple more batteries.
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